Chemical Industry and Engineering Progress ›› 2017, Vol. 36 ›› Issue (03): 951-956.DOI: 10.16085/j.issn.1000-6613.2017.03.024

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Influence of WO3 doping on properties of V2O5/TiO2-SnO2 catalysts for selective catalytic reduction of NOx by NH3

LIAO Yongjin1, ZHANG Yaping2, ZHU Yiwen2, YU Yuexi1, WANG Longfei2   

  1. 1 Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, Guangdong, China;
    2 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2016-08-02 Revised:2016-11-14 Online:2017-03-05 Published:2017-03-05

WO3掺杂对V2O5/TiO2-SnO2催化剂NH3选择性催化还原NOx的影响

廖永进1, 张亚平2, 朱一闻2, 余岳溪1, 王龙飞2   

  1. 1 广东电网有限责任公司电力科学研究院, 广东 广州 510080;
    2 东南大学能源与环境学院, 能源热转换及其过程测控教育部重点实验室, 江苏 南京 210096
  • 通讯作者: 张亚平,副教授,从事大气污染控制方面的研究。
  • 作者简介:廖永进(1971-),男,工学硕士,教授级高级工程师,主要从事火电厂脱硫、脱硝系统的优化与研究工作。E-mail:lyj23455@163.com。
  • 基金资助:

    国家自然科学基金(51306034)、江苏省重点研发计划(BE2015677)及国家重点基础研究发展计划(2013CB228505)项目。

Abstract:

TiO2-SnO2 solid solution was prepared by a co-precipitation method and V2O5-(x%)WO3/TiO2-SnO2 catalysts were prepared by the impregnation method. The physicochemical properties were investigated by BET specific surface area,X-ray diffraction(XRD),in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS), NH3 temperature-programmed desorption (NH3-TPD) and high-resolution transmission electron microscopy(HRTEM). Their catalytic performance for the selective catalytic reduction of NOx was also tested. The results indicate that the catalyst with 12% WO3 exhibits 95% NO conversion within the wide temperature range of 250~400℃. The characterization results show that the specific surface area decreases with the load of WO3 which is in a well-dispersed state. The strength of Brønsted acid sites are intensified after adding WO3 which could account for the best catalytic performance of the catalyst V2O5-12%WO3/TiO2-SnO2.

Key words: WO3, V2O5, TiO2-SnO2 solid solution, support, selective catalytic reduction(SCR), catalyst

摘要:

采用共沉淀法制备TiO2-SnO2固溶体,浸渍法负载WO3和V2O5得到一系列V2O5-(x%)WO3/TiO2-SnO2脱硝催化剂。利用比表面积测定(BET)、X射线衍射(XRD)、原位漫反射傅里叶变换红外光谱(in situ DRIFTS)、程序升温脱附(NH3-TPD)、高分辨率透射电子显微镜(HRTEM)等表征技术,结合脱硝性能测试,研究催化剂的表面特性、微观结构及脱硝活性。结果表明:V2O5-12% WO3/TiO2-SnO2催化剂在250~400℃的温度窗口具有95%的NOx转换率;随着WO3负载量增加,催化剂比表面积有所减小;WO3以无定形态存在于催化剂表面;催化剂表面Brønsted酸中心强度随WO3负载量增加逐渐增大,这是V2O5-(12%)WO3/TiO2-SnO2催化剂具有最佳脱硝活性的主要原因。

关键词: 三氧化钨, 五氧化二钒, TiO2-SnO2固溶体, 载体, 选择催化还原, 催化剂

CLC Number: 

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